Switch from memmap to memmap2.

See https://rustsec.org/advisories/RUSTSEC-2020-0077

cranelift/jit/Cargo.toml

@@ -19,14 +19,14 @@ region = "2.2.0"
 libc = { version = "0.2.42" }
 errno = "0.2.4"
 target-lexicon = "0.11"
-memmap = { version = "0.7.0", optional = true }
+memmap2 = { version = "0.2.1", optional = true }
 log = { version = "0.4.6", default-features = false }
 
 [target.'cfg(target_os = "windows")'.dependencies]
 winapi = { version = "0.3", features = ["winbase", "memoryapi"] }
 
 [features]
-selinux-fix = ['memmap']
+selinux-fix = ['memmap2']
 default = []
 
 [dev-dependencies]

cranelift/jit/src/memory.rs

@@ -5,7 +5,7 @@ use errno;
 use libc;
 
 #[cfg(feature = "selinux-fix")]
-use memmap::MmapMut;
+use memmap2::MmapMut;
 
 use region;
 use std::convert::TryFrom;